JPH0326022Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuel LP gas supply mechanism for industrial vehicles such as forklift trucks.

[Conventional technology]

LP gas is more economical than gasoline etc.
In addition, since it has the advantage that the exhaust gas contains relatively few harmful substances, it has come to be used as a fuel in industrial vehicles such as forklift trucks.

Conventionally, for example, when using LP gas as fuel for forklift trucks, the 8th
As shown in the figure, cylinder a filled with LP gas is loaded horizontally on loading device b fixed on balance weight 4 of forklift truck A, and valve c of cylinder a is connected to the carburetor. It is connected to the fuel hose d and is connected to supply liquefied LP gas to the engine. More specifically, the carburetor is installed to vaporize liquefied LP gas and supply it to the engine.

[Problem that the invention attempts to solve]

However, as mentioned above, the conventional supply mechanism in which liquefied LP gas is vaporized by a carburetor and the vaporized LP gas is sent to the engine has the advantage of providing a stable supply effect at room temperature. On the other hand, it is in a liquefied state.
Since the vaporization heat necessary to instantly vaporize LP gas is obtained from the carburetor, when the temperature is low and the carburetor is extremely cold, such as on a midwinter morning, the LP gas is vaporized. The problem is that the necessary vaporization heat is insufficient for the carburetor to perform the normal vaporization function, resulting in poor starting performance of the engine.

The present invention is an attempt to improve the above-mentioned problems, and is designed so that liquefied LP gas and vaporized LP gas can be selectively supplied to the carburetor. By supplying vaporized LP gas when the carburetor becomes extremely cold and normal vaporization cannot be achieved, it is possible to improve engine starting performance in winter. This is a characteristic feature. The specific means and actions for solving the above problems are as follows.

[Means for solving the problem] Two cylinders are arranged vertically in parallel,
One of the cylinders is connected with a main valve in communication with the liquefied LP gas layer, and the other cylinder is connected with a main valve in communication with the liquefied LP gas layer.

The two main valves are connected to the carburetor so that they can be selectively communicated with each other.

[Effect]

Liquefied LP gas can be taken out from the cylinder by opening the main valve that communicates with the liquefied LP gas layer, and natural vaporization within the cylinder by opening the main valve that communicates with the vaporized LP gas layer. It is possible to take out the LP gas. Therefore, by opening one of the main valves, liquefied LP gas and vaporized LP gas can be selectively supplied to the carburetor.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the illustrative drawings. In the drawings, A indicates a forklift truck. 1 is the body of the forklift truck A, 2 is an engine hood, 3 is a driver's seat provided on the engine hood 2, and 4 is a balance weight provided at the rear of the vehicle body 1; LP gas cylinder loading device B is attached. Reference numeral 6 denotes a mounting board for the loading device B which is horizontally fixed to the upper end surface of the balance weight 4, and the mounting board 6 has flange portions 6', 6' at both left and right ends, and is rectangular in shape. A bottom plate 7 is provided on the mounting board 6 in an overlapping manner. The same bottom plate 7 has two cylinders 5
It is formed into a rectangular shape with a space that allows it to be placed side by side in an upright state, and has flange parts 7a and 7b at both the front and rear ends, and flanges at both the left and right ends. The portions 7c, 7c are integrally formed by bending each side end portion upward. The bottom plate 7 pivots a flange 7a formed at its front end to the front end of the mounting board 6 via hinges 8, 8, so that the bottom plate 7 faces forward with the hinges 8, 8 as a fulcrum. It is installed so that it can be tilted. Furthermore, stoppers 9, 9 for regulating the inclination angle of the bottom plate 7 are attached to both left and right ends of the bottom plate 7 and the mounting board 6.
Each stopper 9 has two link rods 9', 9' which are formed so as to be able to be bent in two, and their ends are connected to the flange parts 7c, 7c of the bottom plate 7 and the flange part 6' of the mounting board 6, respectively. It is provided by being pivotably connected to 6'. Further, the flange portions 7c, 7c and the flange portions 6', 6' have insertion holes 11 for the pins 10, 10 located toward the rear thereof.
a, 11b, 11a, 11b are bored correspondingly, and normally the same insertion holes 11a, 11b, 11a,
By inserting pins 10, 10 into 11b, the bottom plate 7 is fixed horizontally to the mounting board 6. On the other hand, a back plate 12 is erected at the rear end of the bottom plate 7, and a partition plate 13 is erected between the front and rear ends of the bottom plate 7 at a position that bisects the bottom plate 7 into left and right halves. Ru. More specifically, the back plate 12 is formed into a rectangular shape with appropriate height and width dimensions, and its lower end is fixed to the above-mentioned flange portion 7b formed at the rear end of the bottom plate 7. The partition plate 13 is formed to have the same height dimension as the back plate 12, and has a flange portion 13a formed by bending the rear end edge toward the side.
The flange portion 13b formed by fixing the flange portion 13b to the flange portion 7a formed at the front end portion of the bottom plate 7 is provided by fixing the flange portion 13b formed by bending the lower part of the front edge toward the side. Brackets 14a, 14a are provided at both left and right ends of the back plate 12, respectively, extending from positions near the upper end thereof.
The bases of the tightening bands 14, 14 are pivotally attached to the bases a, 14a through hinges 14b, 14b, respectively, so as to be rotatable in the horizontal direction. Each tightening band 1
4 and 14 are curved in an arch shape along the bodies of the cylinders 5a and 5b, and fasteners 16 and 16 are connected to the tips thereof. Furthermore, a horizontally rotatable bracket 1 is provided at the front end of the partition plate 13.
7, 17 are provided, and hooks 15, 15 are attached to the brackets 17, 17 in correspondence with the fasteners 16, 16. Each hook 15 has a male threaded portion 15' cut into its body, and when the male threaded portion 15' is inserted into the mounting hole 17' of the bracket 17, the bracket 17 is attached to the male threaded portion 15'. The length can be freely adjusted by screwing the nuts 18, 18 together from both sides.
Further, each part of the loading device B, such as the bottom plate 7, the back plate 12, and the partition plate 13, is provided so as to be assembled and disassembled by screwing bolts and nuts, as shown in FIG.

However, the two cylinders 5a and 5b to be loaded on the loading device B have a main valve 19 at their necks.
a and 19b are attached. That is, each main valve 1
9a and 19b are the valve bodies 20 and 20, respectively.
The lower part of the cylinder is screwed onto the necks of the cylinders 5a and 5b. And each valve body 2
Gas passages 21, 21 are bored in the vertical direction inside the cylinders 5a, 20, and the lower end openings 21', 21' of the gas passages 21, 21 are provided so as to face the upper positions inside the cylinders 5a, 5b. . In addition, the same gas passage 21,
The valve chamber 2 is connected to the upper part of the valve chamber 21 via the valve seats 22, 22.
3 and 23 are formed, and on-off valves 24 and 24 are installed inside the valve chambers 23 and 23, respectively. Each on-off valve 24, 24
are engaged with the lower ends of the valve shafts 25, 25, and the on-off valves 24, 24 are provided so as to be opened and closed by rotating handles 26, 26 attached to the upper ends of the valve shafts 25, 25. Further, on the sides of the valve chambers 23, 23, there is a gas supply port 2 communicating with the valve chambers 23, 23.
7, 27 are formed. and both gas supply ports 2
Both ends of a separately formed connecting hose 28 are screwed onto the connecting hoses 7 and 27 so that the gas supply ports 27 and 27 can communicate with each other, and a fuel hose 29 extending from the carburetor is attached to the connecting hose 28. The tip of the is connected. Moreover, the main valve 19a,
Among the main valves 19b, one main valve 19a is provided so as to communicate with the LP gas layer in a vaporized state, and the other main valve 19b is provided so as to communicate with the LP gas layer in a liquefied state. That is, the main valve 19b
A siphon pipe 30 is connected to the lower part of the cylinder 5b, and its lower end is provided so as to reach the bottom of the cylinder 5b.
A spring 31 is attached to the lower end, and the spring 31 is provided in such a way that its position can be fixed by bringing it into elastic contact with the bottom wall of the cylinder 5b. Further, an overflow prevention valve 32 is provided near the upper end of the siphon pipe 30. The overflow prevention valve 32 has an upper main body 33 and a lower main body 3.
4 and a floating valve 35. Upper body 3
3 is a bottomless cylinder whose upper part is integrated with the siphon pipe 30, and whose diameter is larger than that of the siphon pipe 30. The lower body 34 has a siphon pipe 30 at the bottom.
It has a cylinder 43 at the top. The cylinder 43 has a guide pin insertion hole 36 in the center and four through holes 37 around the guide pin insertion hole 36. The through holes 37 are open at the top and communicated with the siphon pipe 30 at the bottom. The upper body 33 and the lower body 34 are connected to each other by screws 3.
8, and a space 39 is formed therebetween. The floating valve 35 has a disk-shaped gas sealing plate 40 at its upper part, and a disk-shaped step 41 is provided on its lower surface. The diameter of the gas sealing plate 40 is the same as that of the space 3.
9, and creates a gap around it that is sufficient for gas to escape. The diameter of the step 41 is small and exactly equal to the distance between the opposing through holes 37. Also, the thickness of the stage 41 is such that the gas is not thicker than the gas seal plate 40.
It is thick enough so that it is not obstructed by the lower surface of the A guide pin 42 extends from the center of the lower part of the step 41 and is inserted into the guide pin insertion hole 36. That is, the floating valve 35 is placed on the lower main body 34 and is movable up and down.

Next, its usage and effect will be explained.

As shown in Figure 1, the mounting board 6 of the loading device B is attached to the balance weight 4 of the forklift truck A.
With the cylinders 5a and 5b fixed on top, the cylinders 5a and 5b are placed vertically on both the left and right sides of the bottom plate 7, respectively.
By engaging and locking the fasteners 16, 16 of the tightening bands 14, 14 with the hooks 15, 15, respectively, each cylinder 5a, 5b is secured to the back plate 12 and the partition plate through the tightening action of the bands 14, 14. 13 side, and a state is obtained in which the cylinders 5a and 5b are fixed. With each cylinder 5a, 5b fixed in this manner, both ends of the connecting hose 28 are screwed onto the gas supply ports 27, 27 of the main valves 19a, 19b attached to each cylinder 5a, 5b. By doing so, a state is obtained in which it is possible to send LP gas from either the left or right cylinders 5a, 5b to the fuel hose 29 connected to the connection hose 28.

More specifically, by opening the main valve 19b connecting the siphon pipe 30 by rotating the handle 26, liquefied LP gas is transferred from the bottom of the cylinder 5b to the fuel hose 29 via the siphon pipe 30. By opening the other main valve 19a by rotating the handle 26, the vaporized LP gas naturally vaporized in the cylinder 5a can be sent to the fuel hose 29.

Therefore, when the outside temperature is extremely low and the forced vaporization effect of the carburetor cannot be obtained, by opening the main valve 19a, the vaporized LP gas that has naturally vaporized in the cylinder 5a can be used as fuel. The gas is supplied to the carburetor via a hose 29, where it is mixed with air and sucked into the engine. That is, in this way, it is possible to obtain an LP gas mixture without using the forced vaporization effect of the carburetor, and thereby the engine can be started easily. However, in severe cold weather, the natural vaporization effect in the cylinder 5a is inactive, so after a while after starting the engine as described above, the vaporized LP gas that naturally vaporizes in the cylinder 5a gradually decreases. However, by this time, the carburetor is warmed up by the heat generated by the engine, and the carburetor is now able to obtain the necessary vaporization heat to vaporize the liquefied LP gas. Therefore, at this point, by opening the other main valve 19b and closing the aforementioned main valve 19a, liquefied LP gas is supplied from the cylinder 5b to the carburetor.
The LP gas is forcibly vaporized within the carburetor through the heat of vaporization mentioned above, and is inhaled into the engine as an air-fuel mixture, allowing the engine to continue operating. In addition, as mentioned above, when the outside temperature is not extremely low at room temperature, it is of course possible to use liquefied LP gas from the time the engine starts, and when using vaporized LP gas. However, at room temperature, the natural vaporization action within the cylinder 5a is active, so it is possible to continuously operate the engine with only this naturally vaporized LP gas without causing a gas shortage. In addition, by mixing the naturally vaporized LP gas with air in a carburetor and feeding this mixture into the engine, complete combustion is possible, resulting in a unique feature that makes the exhaust gas clean and odorless. You can get the effect. As mentioned above, at room temperature, LP gas can be supplied from either of the two cylinders 5a and 5b, so when one cylinder is empty, the other cylinder is continuously by opening the main valve of
It is possible to supply LP gas.

On the other hand, in the loading device B, the forklift truck A has an inspection port for the engine part opened on the upper end surface of the engine hood 2,
It is installed so as to block the inspection opening. When inspecting the engine part, the driver's seat 3 is tilted backwards and the inspection work is carried out. It is possible to normally knock down the loading device B without hitting it. That is, by tilting the bottom plate 7 as shown by the chain line in FIG. It can be held in a tilted position. In the above embodiment, the stoppers 9 are each formed by two link rods 9', 9', but the stoppers 9 are intended to prevent the loading device B from falling over more than necessary. The same stoppers 9, 9 are the link rods 9', 9 as described above.
It is also possible to use a chain instead of 9'. Furthermore, depending on the loading device B being used on a vehicle other than a forklift truck, or depending on the mounting position, it may not be necessary to provide the function of tilting the bottom plate 7, and in such cases, the mounting board 6 may be used. Instead, it is also possible to attach the bottom plate 7 directly to the vehicle body. Furthermore, in the above embodiment, the tightening band 14 is attached to the back plate 1.
While attaching the hook 15 to the partition plate 13
However, the attachment position of each tightening band 14 and hook 15 can also be reversed.

In addition, in the excessive flow prevention valve 32, when the cylinder is filled with high pressure LP gas and the gas is constantly flowing into the gas supply port 27 by operating the main valve 19b, the floating valve 35 is in the position shown in FIG. Therefore, the gas passes through the through hole 37 from inside the cylinder 5b, passes through the space 39, and is sent to the gas supply port 27. However, on the gas supply port 27 side,
For example, if the connection hose 28 or the fuel hose 29 is damaged and gas leaks, the gas pressure on the gas supply port 27 side will drop rapidly. Then, the floating valve 35 floats due to the gas pressure difference, sealing off the upper surface of the space 39, and as a result, gas is not sent and gas leakage is prevented. On the other hand, all the gas in the cylinder 5b is consumed, and new gas is added to the cylinder 5b.
When filling the inside of the cylinder 5b, gas can be sent into the cylinder 5b from the gas supply port 27 to fill the cylinder 5b. In this case, the floating valve 35 is in the position shown in FIG. 6, and the gas can be sufficiently filled into the cylinder through the gap in the wide space 39.

[Effect of idea]

The present invention is constructed as described above, and as described above, two cylinders are installed vertically, and liquefied LP gas is supplied from one cylinder, and liquefied LP gas is supplied from the other cylinder into the same cylinder. in a vaporized state that naturally vaporizes in
By making it possible to selectively take out LP gas and supply it to the carburetor by opening and closing the valves, we have achieved the following effects.

If the carburetor is cold and insufficient heat of vaporization cannot be obtained, the engine can be started easily by supplying LP gas in a vaporized state, and then switched to liquefied LP gas after starting. This allows the engine to continue operating.

At room temperature, either liquefied or vaporized LP gas can be used continuously, so one of the two cylinders can be used as a spare cylinder in case the fuel runs out.

[Brief explanation of drawings]

Figures 1 to 7 are drawings showing an embodiment of the present invention, in which Figure 1 is a side view of a forklift truck equipped with a cylinder loading device, and Figure 2 is a side view of a forklift truck equipped with a cylinder loading device. A front view showing the condition,
FIG. 3 is a plan view thereof, FIG. 4 is an exploded perspective view of the loading device, FIGS. 5 and 6 are longitudinal cross-sectional views showing two types of main valves, and FIG. A
8 is a side view of a conventional forklift truck. A...Forklift truck, B...Loading device, 1...Vehicle body, 2...Engine hood, 3...
Driver seat, 4...Balance weight, 5a, 5b
...Cylinder, 6...Mounting board, 6'...Flange section, 7...Bottom plate, 7a, 7b, 7c...Flange section, 8...Hinge, 9...Stopper, 9'...
Link rod, 10... Pin, 11a, 11b... Insertion hole, 12... Back plate, 13... Partition plate, 13a,
13b...Flange part, 14...Tightening band, 1
4a...Bracket, 14b...Hinge, 15...
Hook, 15'...male thread, 16...clamp,
17...Bracket, 17'...Mounting hole, 18
...Natsuto, 19a, 19b...Main valve,
20... Valve body, 21... Gas passage, 22
... Valve seat, 23 ... Valve chamber, 24 ... Opening/closing valve, 25
... Valve shaft, 26 ... Handle, 27 ... Gas supply port, 28 ... Connection hose, 29 ... Fuel hose,
30...Siphon tube, 31...Spring, 32
...Excess flow prevention valve, 33... Upper body, 34...
... Lower body, 35 ... Floating valve, 36 ... Guide pin insertion hole, 37 ... Through hole, 38 ... Screw, 39 ...
...Space part, 40... Gas sealing plate, 41... Step, 4
2...Guide pin, 43...Cylinder.

Claims (1)

[Scope of utility model registration request] Two cylinders are arranged vertically in parallel, and one cylinder is connected to a main valve that communicates with the LP gas layer in a vaporized state, and the other cylinder is connected to a layer of liquefied LP gas. An LP gas supply mechanism in an industrial vehicle, which is equipped with a main valve and connected to a carburetor so that both main valves can be selectively communicated with each other.